TV Keeps Blinking Darker but Keeps Image

TV Keeps Blinking Darker but Keeps Image

The past few weeks my TV keeps blinking to a darker version of the image on the TV. Example. If I am watching a show the image stays on the screen the entire time but it will have a random flash of the same image just darker (like a shadow). It is the entire screen. Not pixelated at all. It happens no matter what I am watching. The blinking is becoming more frequent. Any thoughts of what is wrong?

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